1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2014 SAE InternationalAll rights reserved. No part of this publi
3、cation may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS5749FAEROSPACE MATERIAL SPECIFICATIONAMS5749 REV. FIssued 1973-12Reaffirmed 2008-05Revised
5、 2014-06Superseding AMS5749DSteel, Corrosion-Resistant, Bars, Wire, Forgings, and Tubing14.5Cr - 4.0Mo - 1.2V (1.10-1.20C)Premium Quality for Bearing Applications, Double Vacuum Melted(Composition similar to UNS S42700)RATIONALEAMS5749F revises Condition (3.3.1), Macrostructure (3.4.1), Decarburizat
6、ion (3.4.3.5), Response to Heat Treatment (3.4.4), Acceptance Tests (4.2.1), Sampling and Testing (4.3.3), and Reports (4.4) and is a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers a premium aircraft-quality, corrosion-resistant steel in the form of bars,
7、 wire, forgings, mechanical tubing, and forging stock.1.2 ApplicationThese products have been used typically for parts requiring a through-hardening, corrosion-resistant steel, operating under heavy loads at high speeds, requiring resistance to wear and softening at elevated temperatures, and subjec
8、t to rigid inspection standards, but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent supplied herein. The supplier may work to a subsequent revision of a
9、 document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA
10、15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2241 Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and WireAMS2243 Tolerances, Corrosion and Heat-Resistant Steel TubingSAE INTERNATIONAL AMS5749F Page
11、2 of 8AMS2248 Chemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other Highly-Alloyed Steels, and Iron AlloysAMS2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection ProcedureAMS2371 Quality Assurance Sampling and Testing, Corrosion
12、and Heat-Resistant Steels and Alloys, Wrought Products and Forging StockAMS2374 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steel and Alloy ForgingsAMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant
13、 Steels and AlloysAMS2808 Identification, ForgingsAS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft Quality Steel Bars and Mechanical Tubing2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,Tel:
14、 610-832-9585, www.astm.org.ASTM A 370 Mechanical Testing of Steel ProductsASTM A 604 Macrotech Testing of Consumable Electrode Remelted Steel Bars and BilletsASTM E 45 Determining the Inclusion Content of SteelASTM E 112 Determine Average Grain SizeASTM E 353 Chemical Analysis of Stainless, Heat-Re
15、sisting, Maraging, and Other Similar Chromium-Nickel-Iron AlloysASTM E 384 Knoop and Vickers Hardness of Materials3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 353, by spectrochemical
16、methods, or by other analytical methods acceptable to purchaser.TABLE 1 COMPOSITIONElement min maxCarbon 1.10 1.20Manganese 0.30 0.60Silicon 0.20 0.40Phosphorus - 0.015Sulfur - 0.010Chromium 14.00 15.00Molybdenum 3.75 4.25Vanadium 1.10 1.30Nickel - 0.40Copper - 0.353.1.1 Check AnalysisComposition va
17、riations shall meet the applicable requirements of AMS2248.SAE INTERNATIONAL AMS5749F Page 3 of 83.2 Melting PracticeSteel shall be double vacuum melted, using vacuum induction melting practice followed by vacuum consumable electrode remelting.3.3 ConditionThe product shall be supplied in the follow
18、ing condition; hardness and tensile strength shall be determined in accordance with ASTM A 370:3.3.1 BarsAnnealed having hardness not higher than 269 HB, or equivalent (See 8.2).Bar shall not be cut from plate (Also see 4.4.23.3.1.1 All hexagons regardless of size and other bars 2.750 inches (69.85
19、mm) and under in nominal diameter or least distance between parallel sides shall be cold finished.3.3.1.2 Bars, other than hexagons, over 2.750 inches (69.85 mm) in nominal diameter or least distance between parallel sides shall be hot finished.3.3.2 WireCold finished and annealed having tensile str
20、ength not higher than 130 ksi (896 MPa), or equivalent hardness (See 8.3) except that for wire 0.062 inch (1.59 mm) and under in nominal diameter tensile strength shall not apply unless agreed upon by purchaser and vendor.3.3.3 ForgingsAs ordered3.3.4 Mechanical TubingAnnealed and cold finished havi
21、ng hardness not higher than 293 HB, or equivalent (See 8.2).3.3.5 Forging StockAs ordered by the forging manufacturer.3.4 PropertiesThe product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A 370:3.4.1 MacrostructureVisual examination of tra
22、nsverse sections from bars, billets, tube rounds, and forging stock, etched in hot hydrochloric acidin accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A 604 shown in Table 2.TABLE 2 -
23、MACROSTRUCTURE LIMITSClass Condition Severity1Freckles A2 White Spots A3 Radial Segregation B4 Ring Pattern BSAE INTERNATIONAL AMS5749F Page 4 of 83.4.2 Micro-Inclusion RatingNo specimen shall exceed the limits of Table 3, determined in accordance with ASTM E 45, Method D.TABLE 3 - MICRO-INCLUSION R
24、ATING LIMITSTypeAThinAHeavyBThinBHeavyCThinCHeavyDThinDHeavyWorst Field Severity 1.5 1.0 1.0 1.0 1.0 1.0 1.5 1.0Worst Field Frequency, maximum x 1 x 1 x 1 3 1Total Rateable Fields, Frequency, maximum y 1 y 1 y 1 8 1X Combined A+B+C, not more than 3 fieldsY Combined A+B+C, not more than 8 fields3.4.2
25、.1 A rateable field is defined as one which has a type A, B, C, or D inclusion rating of at least No. 1.0 thin or heavy in accordance with the Jernkontoret Chart, Plate Ir, ASTM E 45.3.4.3 Decarburization3.4.3.1 Bars, wire, and mechanical tubing ordered ground, turned, or polished shall be free from
26、 decarburization on the ground, turned, or polished surfaces.3.4.3.2 Allowable decarburization of bars, wire, billets, and tube rounds ordered for redrawing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and vendor.3.4.3.3 Decarburization of bars and wir
27、e to which 3.4.3.1 or 3.4.3.2 is not applicable shall be not greater than shown in Table 4.TABLE 4A - MAXIMUM DECARBURIZATION, INCH/POUND UNITSNominal Diameter or DistanceBetween Parallel SidesInchesTotal Depth ofDecarburizationInchUp to 0.500, incl 0.015Over 0.500 to 1.000, incl 0.030Over 1.000 to
28、2.000, incl 0.040Over 2.000 to 3.000, incl 0.050Over 3.000 to 4.000, incl 0.065Over 4.000 to 5.000, incl 0.095TABLE 4B - MAXIMUM DECARBURIZATION, SI UNITSNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth ofDecarburizationMillimetersUp to 12.70, incl 0.38Over 12.70 to 25.40, in
29、cl 0.76Over 25.40 to 50.80, incl 1.02Over 50.80 to 76.20, incl 1.27Over 76.20 to 101.60, incl 1.65Over 101.60 to 127.00, incl 2.413.4.3.4 Decarburization of tubing to which 3.4.3.1 or 3.4.3.2 is not applicable shall be not greater than shown in Table 5.SAE INTERNATIONAL AMS5749F Page 5 of 8TABLE 5A
30、- MAXIMUM DECARBURIZATION, INCH/POUND UNITSNominalOutside DiameterInchesTotal Depth ofDecarburizationInchesUp to 1.000, incl 0.025Over 1.000 to 2.000, incl 0.035Over 2.000 to 3.000, incl 0.045Over 3.000 to 4.000, incl 0.055Over 4.000 to 5.000, incl 0.080TABLE 5B - MAXIMUM DECARBURIZATION, SI UNITSNo
31、minalOutside DiameterMillimetersTotal Depth ofDecarburizationMillimetersUp to 25.40, incl 0.64Over 25.40 to 50.80, incl 0.89Over 50.80 to 76.20, incl 1.14Over 76.20 to 101.60, incl 1.40Over 101.60 to 127.00, incl 2.033.4.3.5 Decarburization shall be measured by the metallographic method or by a trav
32、erse method using microhardness testing in accordance with ASTM E 384. The hardness method(s) shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by a hardness method, is define
33、d as the perpendicular distance from the surface to the depth under that surface below which there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface. In case of dispute, the depth
34、 of decarburization determined using the microhardness traverse method shall govern.3.4.3.5.1 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inch (0.13 mm) and th
35、e width is 0.065 inch (1.65 mm) or less.3.4.4 Response to Heat TreatmentSpecimens as in 4.3.3, taken from bars or billets shall have hardness not lower than 60 HRC or equivalent (See 8.2), after being heat treated as follows:3.4.4.1 Harden by heating to 2050 F 25 (1121 C 14), holding at heat for one
36、 hour per inch (25 mm) of maximum cross section but not less than 30 minutes, and quenching in oil or quenching for 5 to 6 minutes in a salt bath maintained at 1050 F 15 (566 C 8), and cooling in air.3.4.4.2 Stress relieve by heating to 300 F 15 (149 C 8), holding at heat for 60 minutes 5, and cooli
37、ng in air.3.4.4.3 Cold treat by cooling to -100 F 10 (-73 C 6), holding at that temperature for not less than 15 minutes, and warming in air.3.4.4.4 Double temper by heating to 975 F 15 (524 C 8), holding at heat for two hours 0.25, cooling in air, cooling in air, reheating to 975 F 15 (524 C 8), ho
38、lding at heat for 2 hours 0.25, and cooling in air.3.4.5 Average Grain SizeShall be ASTM No. 7 or finer, determined in accordance with ASTM E 112 after austenitizing and quenching as in 3.4.4.SAE INTERNATIONAL AMS5749F Page 6 of 83.5 QualityThe product, as received by purchaser, shall be uniform in
39、quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product.3.5.1 Steel shall be premium aircraft-quality conforming to AMS2300.3.5.2 Bars and mechanical tubing ordered hot rolled or cold drawn, or ground, turned, or polished shall, after
40、removal of the standard stock removal allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the ground, turned, or polished surface.3.5.3 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the general contour of the forging
41、s showing no evidence of reentrant grain flow.3.6 Tolerances3.6.1 Shall conform to all applicable requirements of the following:3.6.2 Bars and WireAMS2241; for sizes not covered by AMS2241, tolerances shall be as agreed upon by purchaser and vendor.3.6.3 Mechanical TubingAMS2243.4. QUALITY ASSURANCE
42、 PROVISIONS4.1 Responsibility for InspectionThe vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the prod
43、uct conforms to specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsThe following requirements are acceptance tests and shall be performed on each heat or lot as applicable.4.2.1.1 Composition (3.1), macrostructure (3.4.1) and micro-inclusion rating (3.4.2) of each heat, and hard
44、ness (3.4.4) after austenitizing, quenching, stress relieving, cold treating, and double tempering of each heat (Or lot, see4.3.3.1).4.2.1.2 Condition (3.3), decarburization (3.4.3), and average grain size (3.4.5) after austenitizing and quenching, of each lot.4.2.1.3 Tolerances (3.6) of bars.4.2.2
45、Periodic TestsFrequency-severity cleanliness rating (3.5.1) and grain flow of die forgings (3.5.3) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.4.3 Sampling and TestingShall be as follows:SAE INTERNATIONAL AMS57
46、49F Page 7 of 84.3.1 Bars, Wire, Mechanical Tubing, and Forging StockIn accordance with AMS2371.4.3.2 ForgingsIn accordance with AMS2374.4.3.3 Specimens for response to heat treatment (3.4.4) shall be taken midway between surface and center of samples representing the top and bottom of each remelted
47、 ingot obtained from semi-finished or finished product. The surface to be tested shall be ground sufficiently to remove any surface condition, scale, carburization, or decarburization that might affect readings.4.3.3.1 Alternately, the specimen may be obtained from the finished lot.4.4 Reports4.4.1
48、The vendor of bars, wire, forgings or tubing shall furnish with each shipment a report showing the vendors name and country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, macrostructure, micro-incl
49、usion rating and for reponse to heat treatment of each heat (Or lot, see 4.3.3.1) and for average grain size of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS5749F, size, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall als
